Why is it necessary to have controls for maintaining a minimum high-side pressure on outdoor air-cooled condensers?
A) Compressors will not operate correctly if the compression ratio is too low.
B) The chemical components in the refrigerant will separate if the pressure is allowed to drop below the normal minimum operating pressure.
C) The refrigerant will not condense if it is excessively cooled.
D) Refrigeration metering devices require a minimum pressure drop to operate.
D
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Which of the following statements is false?
A. On a xy diagram, if the y (vapor-phase composition) crosses the y = x line, the system will exhibit an azeotrope. B. The larger the relative volatility for a binary mixture, the easier it will be (in general) to separate those two components through distillation. C. For a system that obeys Raoult’s Law, the K-factor for a component is simply the vapor-pressure of that component divided by the system pressure. D. The K-factors for the components in a mixture, by definition, cannot all be < 1. E. At an azeotrope, the relative volatility for a system is, by definition, equal to 1.
Describe some of the aspects that make AFC systems different from SPFC (PEM) systems.
What will be an ideal response?
____________________ grade refers to the amount of lean retail cuts that will come from a carcass.
Fill in the blank(s) with the appropriate word(s).
Line voltage thermostats can usually switch:
A) 15 amps. B) 240 amps. C) 120 amps. D) 2 amps or less.